Magnetic molecules known as molecular nanomagnets (MNMs) may be the key to ultra-high density data storage. Thus, novel strategies on how to design MNMs are desirable. Here, inspired by the hexagonal structure of the hardest intermetallic magnet SmCo5, we have synthesized a nanomagnetic molecule where the central lanthanide (Ln) ErIII is coordinated solely by three transition metal ions (TM) in a perfectly trigonal planar fashion. This intermetallic molecule [ErIII(ReICp2)3] (ErRe3) starts a family of molecular nanomagnets (MNM) with unsupported Ln-TM bonds and paves the way towards molecular intermetallics with strong direct magnetic exchange interactions—a promising route towards high-performance single-molecule magnets.
ErIII complexes are potential candidates for high-performance single molecule magnets (SMMs) just after DyIII. Herein, we thoroughly explore the under-represented class of neutral pseudo-tetrahedral ErIII SMMs and demonstrate their exceptional...
The structures and magnetic properties of photoresponsive
magnets
can be controlled or fine-tuned by visible light irradiation, which
makes them appealing as candidates for ternary memory devices: photochromic
and photomagnetic at the same time. One of the strategies for photoresponsive
magnetic systems is the use of photochromic/photoswitchable molecules
coordinated to paramagnetic metal centers to indirectly influence
their magnetic properties. Herein, we present two erbium(III)-based
coordination systems: a trinuclear molecule {[ErIII(BHT)3]3(dtepy)2}.4C5H12 (1) and a 1D coordination chain {[ErIII(BHT)3(azopy)}
n
·2C5H12 (2), where the bridging photochromic
ligands belong to the class of diarylethenes: 1,2-bis((2-methyl-5-pyridyl)thie-3-yl)perfluorocyclopentene
(dtepy) and 4,4′-azopyridine (azopy), respectively (BHT = 2,6-di-tert-butyl-4-methylphenolate). Both compounds show slow
dynamics of magnetization, typical for single-molecule magnets (SMMs)
as revealed by alternating current (AC) magnetic susceptibility measurements.
The trinuclear compound 1 also shows an immediate color
change from yellow to dark blue in response to near-UV irradiation.
Such behavior is typical for the photoisomerization of the open form
of the ligand into its closed form. The color change can be reversed
by exposing the closed form to visible light. The chain-like compound 2, on the other hand, does not show significant signs of the
expected trans–cis photoisomerization
of the azopyridine in response to UV irradiation and does not appear
to show photoswitching behavior.
The structure and magnetic properties of photo-responsive magnets can be controlled or fine-tuned by visible light irradiation which makes them appealing as candidates for ternary memory devices: photochromic and photomagnetic at the same time. One of the strategies for photo-responsive magnetic systems is the use of photochromic/photoswitchable molecules coordinated to paramagnetic metal centers to in-directly influence their magnetic properties. Herein, we present two erbium(III) based coordination systems: a trinuclear molecule {[ErIII(BHT)3]3(dtepy)2}.3C5H12 (1) and a 1-D coordination chain {[ErIII(BHT)3(azopy)}nnC5H12 (2), where the bridging photochromic ligands belong to the class of diarylethenes: 1,2-bis(2-methyl-5-pyridyl)thie-3-yl)perfluorocyclopentene (dtepy) and 4,4'-azopyridine (azopy), respectively (BHT = 2,6-di-tert-butyl-4-methylphenolate). Both compounds show slow dynamics of the magnetization, typical for single-molecule magnets (SMMs) as revealed by alternating current (AC) magnetic susceptibility measurements. The trinuclear compound 1, shows also an immediate color change from yellow to dark blue in response to near-UV irradiation. Such a behavior is typical for the photo-isomerization of the open-form of the ligand o-dtepy ligand into its closed-form c-dtepy. The color change can be reversed by exposing the c-dtepy to visible light. The chain-like compound 2, on the other hand, does not show significant signs of the expected trans-cis photoisomerization in response to UV irradiation and does not appear to show photoswitching behavior.
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